//sha1.h：对字符串进行sha1加密
#ifndef _SHA1_H_
#define _SHA1_H_

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


typedef struct SHA1Context
{
    unsigned Message_Digest[5];
    unsigned Length_Low;
    unsigned Length_High;
    unsigned char Message_Block[64];
    int Message_Block_Index;
    int Computed;
    int Corrupted;
} SHA1Context;

void SHA1Reset(SHA1Context *);
int SHA1Result(SHA1Context *);
void SHA1Input( SHA1Context *,const char *,unsigned);
#endif


#define SHA1CircularShift(bits,word) ((((word) << (bits)) & 0xFFFFFFFF) | ((word) >> (32-(bits))))

void SHA1ProcessMessageBlock(SHA1Context *);
void SHA1PadMessage(SHA1Context *);

void SHA1Reset(SHA1Context *context) // 初始化动作
{
    context->Length_Low             = 0;
    context->Length_High            = 0;
    context->Message_Block_Index    = 0;

    context->Message_Digest[0]      = 0x67452301;
    context->Message_Digest[1]      = 0xEFCDAB89;
    context->Message_Digest[2]      = 0x98BADCFE;
    context->Message_Digest[3]      = 0x10325476;
    context->Message_Digest[4]      = 0xC3D2E1F0;

    context->Computed   = 0;
    context->Corrupted  = 0;
}


int SHA1Result(SHA1Context *context) // 成功返回1，失败返回0
{
    if (context->Corrupted)
    {
        return 0;
    }
    if (!context->Computed)
    {
        SHA1PadMessage(context);
        context->Computed = 1;
    }
    return 1;
}


void SHA1Input(SHA1Context *context,const char *message_array,unsigned length)
{
    if (!length) return;

    if (context->Computed || context->Corrupted)
    {
        context->Corrupted = 1;
        return;
    }

    while(length-- && !context->Corrupted)
    {
        context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);

        context->Length_Low += 8;

        context->Length_Low &= 0xFFFFFFFF;
        if (context->Length_Low == 0)
        {
            context->Length_High++;
            context->Length_High &= 0xFFFFFFFF;
            if (context->Length_High == 0) context->Corrupted = 1;
        }

        if (context->Message_Block_Index == 64)
        {
            SHA1ProcessMessageBlock(context);
        }
        message_array++;
    }
}

void SHA1ProcessMessageBlock(SHA1Context *context)
{
    const unsigned K[] = {0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6 };
    int         t;
    unsigned    temp;
    unsigned    W[80];
    unsigned    A, B, C, D, E;

    for(t = 0; t < 16; t++)
    {
        W[t] = ((unsigned) context->Message_Block[t * 4]) << 24;
        W[t] |= ((unsigned) context->Message_Block[t * 4 + 1]) << 16;
        W[t] |= ((unsigned) context->Message_Block[t * 4 + 2]) << 8;
        W[t] |= ((unsigned) context->Message_Block[t * 4 + 3]);
    }

    for(t = 16; t < 80; t++)  W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);

    A = context->Message_Digest[0];
    B = context->Message_Digest[1];
    C = context->Message_Digest[2];
    D = context->Message_Digest[3];
    E = context->Message_Digest[4];

    for(t = 0; t < 20; t++)
    {
        temp =  SHA1CircularShift(5,A) + ((B & C) | ((~B) & D)) + E + W[t] + K[0];
        temp &= 0xFFFFFFFF;
        E = D;
        D = C;
        C = SHA1CircularShift(30,B);
        B = A;
        A = temp;
    }
    for(t = 20; t < 40; t++)
    {
        temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];
        temp &= 0xFFFFFFFF;
        E = D;
        D = C;
        C = SHA1CircularShift(30,B);
        B = A;
        A = temp;
    }
    for(t = 40; t < 60; t++)
    {
        temp = SHA1CircularShift(5,A) + ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
        temp &= 0xFFFFFFFF;
        E = D;
        D = C;
        C = SHA1CircularShift(30,B);
        B = A;
        A = temp;
    }
    for(t = 60; t < 80; t++)
    {
        temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];
        temp &= 0xFFFFFFFF;
        E = D;
        D = C;
        C = SHA1CircularShift(30,B);
        B = A;
        A = temp;
    }
    context->Message_Digest[0] = (context->Message_Digest[0] + A) & 0xFFFFFFFF;
    context->Message_Digest[1] = (context->Message_Digest[1] + B) & 0xFFFFFFFF;
    context->Message_Digest[2] = (context->Message_Digest[2] + C) & 0xFFFFFFFF;
    context->Message_Digest[3] = (context->Message_Digest[3] + D) & 0xFFFFFFFF;
    context->Message_Digest[4] = (context->Message_Digest[4] + E) & 0xFFFFFFFF;
    context->Message_Block_Index = 0;
}

void SHA1PadMessage(SHA1Context *context)
{
    if (context->Message_Block_Index > 55)
    {
        context->Message_Block[context->Message_Block_Index++] = 0x80;
        while(context->Message_Block_Index < 64)  context->Message_Block[context->Message_Block_Index++] = 0;
        SHA1ProcessMessageBlock(context);
        while(context->Message_Block_Index < 56) context->Message_Block[context->Message_Block_Index++] = 0;
    }
    else
    {
        context->Message_Block[context->Message_Block_Index++] = 0x80;
        while(context->Message_Block_Index < 56) context->Message_Block[context->Message_Block_Index++] = 0;
    }
    context->Message_Block[56] = (context->Length_High >> 24 ) & 0xFF;
    context->Message_Block[57] = (context->Length_High >> 16 ) & 0xFF;
    context->Message_Block[58] = (context->Length_High >> 8 ) & 0xFF;
    context->Message_Block[59] = (context->Length_High) & 0xFF;
    context->Message_Block[60] = (context->Length_Low >> 24 ) & 0xFF;
    context->Message_Block[61] = (context->Length_Low >> 16 ) & 0xFF;
    context->Message_Block[62] = (context->Length_Low >> 8 ) & 0xFF;
    context->Message_Block[63] = (context->Length_Low) & 0xFF;

    SHA1ProcessMessageBlock(context);
}

/*
int sha1_hash(const char *source, char *lrvar){// Main
    SHA1Context sha;
    char buf[128];

    SHA1Reset(&sha);
    SHA1Input(&sha, source, strlen(source));

    if (!SHA1Result(&sha)){
        printf("SHA1 ERROR: Could not compute message digest");
        return -1;
    } else {
        memset(buf,0,sizeof(buf));
        sprintf(buf, "%08X%08X%08X%08X%08X", sha.Message_Digest[0],sha.Message_Digest[1],
        sha.Message_Digest[2],sha.Message_Digest[3],sha.Message_Digest[4]);
        //lr_save_string(buf, lrvar);

        return strlen(buf);
    }
}
*/

char * sha1_hash(const char *source) // Main
{
    SHA1Context sha;
    char *buf;//[128];

    SHA1Reset(&sha);
    SHA1Input(&sha, source, strlen(source));

    if (!SHA1Result(&sha))
    {
        printf("SHA1 ERROR: Could not compute message digest");
        return NULL;
    }
    else
    {
        buf=(char *)malloc(128);
        memset(buf,0,sizeof(buf));
        sprintf(buf, "%08X%08X%08X%08X%08X", sha.Message_Digest[0],sha.Message_Digest[1],
                sha.Message_Digest[2],sha.Message_Digest[3],sha.Message_Digest[4]);
        //lr_save_string(buf, lrvar);

        //return strlen(buf);
        return buf;
    }
}
